The Spherical Model of the Radiative Transfer in the Earth Atmosphere. - III. Formulation of the Problem. The Computational Method

The mathematical statement of the problem is gived to determine the sunlight field of the Earth to scale over all planets. The characteristic method is described for a spherical shell with the axial symmetry. The algorithm is presented to compute the first and multiple scattering approximation. The algorithm taking account of the highly anisotropic scattering with the separation of the aerosol and molecular components is suggested. The calculations sequence different from the simple iterations is determined. The algorithm structure and the computational modules are presented.